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After replacing the crankshaft position sensor now the engine does not crank?

Tiny
RONALD DEVOLD
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I changed the crankshaft position sensor and now the car will not crank. I can hear the fuel pump activating. And I also reprogrammed the ECU, but it still will not crank. And help will gladly be appreciated.
Friday, August 26th, 2022 AT 11:32 AM

22 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

When you say it won't crank, do you mean the starter won't engage to turn the engine or it does, but the engine fails to start?

If the starter is working, see if it starts for a couple of seconds using starting fluid. If it does, we know it's a fuel-related issue. If there is no change, confirm there is spark to the plugs.

Here is a link you may find helpful:

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

If it is starter related, let me know what you have checked so far and how the ECU was reprogrammed.

Take care and let me know what you find.

Joe
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Friday, August 26th, 2022 AT 2:06 PM
Tiny
RONALD DEVOLD
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At first, it will not crank. I connected the positive and negative battery cables together overnight. It will crank now but will not start. The starting fluid did not work. I am getting voltage at every coil pack.
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Saturday, August 27th, 2022 AT 7:25 AM
Tiny
JACOBANDNICKOLAS
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Hi,

Ronald, if the starting fluid made no difference, we need to confirm there is spark. I realize there is power to the coils, but the PCM may not be providing a ground path to fire them.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

If there is spark and starting fluid made no difference, then we have an internal issue. Is it possible for you to record it and upload it for me to hear when cranking? I can usually tell a lot by that as far as compression, timing, and so on.

Let me know.

Take care,

Joe

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Saturday, August 27th, 2022 AT 6:45 PM
Tiny
RONALD DEVOLD
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  • 105 POSTS
I am getting no spark.
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Monday, August 29th, 2022 AT 9:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

If you replaced the sensor there is either a connection issue, a faulty sensor, or something that has failed in the ECU. By chance, did you get the sensor online? I have been seeing so many faulty parts online. Also, if you have a live data scan tool, did you check for an RPM signal when cranking the engine?

You could have voltage to the coils, but to complete the circuit for spark, there needs to be a signal ground from the ECU. There is also a ground on the transmission for all coils.

At each coil, there will be a black wire. That is the ground for all coils. Confirm there is continuity to ground on all black wires.

If there is, at each coil you have a pink wire which is power, the black that I mentioned, a brown wire which is the signal ground, and a fourth will be different of each coil. Check to see if there is a signal ground at each of the signal grounds as well when the engine is cranking.

Check these two things and let me know. Also, check for a ground on the black wires as well.

So, you have a reference, I attached the coil schematic below. Also, let me know how you reprogrammed the ECU and if you still have the original crank sensor, switch it with the new one and see if you get spark.

Take care,

Joe

See pic below.
Image (Click to make bigger)
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Monday, August 29th, 2022 AT 6:04 PM
Tiny
RONALD DEVOLD
  • MEMBER
  • 105 POSTS
So now I have another issue. I actually misplaced the key to the car. I replaced it with another lock cylinder with key. Luckly, I had some old keys that allowed me to take the lock cylinder out. But now, the security light stays on (not blinking) and on the message center it says Service Vehicle Theft Deterrent System. I did reprogram the Theft Module and Theft System. I also tried the 3X 10 minute relearn but it won't work because the light is not blinking. So long as the security light stays on and the Theft message the car will not crank.
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Thursday, September 1st, 2022 AT 6:27 AM
Tiny
JACOBANDNICKOLAS
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Hi,

It sounds like you have the same kind of luck I do. LOL I have a favor to ask. I need you to start a new thread for this question. We try to keep them specific to one topic so it's more helpful to others. I hope you understand. Just copy and paste your question to a new post. Here is the link.

https://www.2carpros.com/questions/new

Again, I hope you understand.

Take care,

Joe
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Thursday, September 1st, 2022 AT 7:28 PM
Tiny
RONALD DEVOLD
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Okay. I'm back with the same issue. Crank no start. I could not find the original crank sensor. But I will keep looking.
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Tuesday, September 6th, 2022 AT 2:44 PM
Tiny
RONALD DEVOLD
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To add on, I tested the fuel system. I am getting 50 PSI pressure when the key is turned on. I connected a test light to the fuel pump fuse and when the key is in the on position the light lights up, indicating fuel is pressurized, but when cranking the light will not light up.
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Tuesday, September 6th, 2022 AT 3:45 PM
Tiny
JACOBANDNICKOLAS
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Hi,

The idea that you have power at the fuse at first and then it stops is normal. The fuel pump is powered to prime the system briefly and then the power is cut to it until the PCM recognizes ignition. If there is no ignition, it won't power again until the key is turned off and then back on.

You know, this all started when the sensor was replaced. Was there an issue requiring the sensor replacement? If so, let me know what it was. Additionally, check to see if there are presently any diagnostic trouble codes.

Let me know.

Joe
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Tuesday, September 6th, 2022 AT 6:35 PM
Tiny
RONALD DEVOLD
  • MEMBER
  • 105 POSTS
There was no issue with the sensor. I rebuilt the engine a basically changed every electrical sensor except the MAF sensor. I used a code reader and only got the P0315, P0335. I use a Snap-On Pro Solus and I'm getting the crank code and an immobilizer code.
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Tuesday, September 6th, 2022 AT 7:15 PM
Tiny
JACOBANDNICKOLAS
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Hi,

What immobilizer code are you getting? The 315 is for the cam sensor and 335 is the crank. There is no signal to the ECM.

Let me know.

Joe
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Wednesday, September 7th, 2022 AT 6:20 PM
Tiny
RONALD DEVOLD
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I was unable to find the original crankshaft sensor.
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Tuesday, September 13th, 2022 AT 6:12 PM
Tiny
JACOBANDNICKOLAS
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Hi,

Is the new sensor under warranty? If it is, switch it with a new one. You may have gotten a bad one. Also, if the cam sensor was also replaced, do the same.

I attached the diagnostics below for the P0335. We need to start somewhere to see why we aren't getting a crank signal to the PCM.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.
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Tuesday, September 13th, 2022 AT 8:42 PM
Tiny
RONALD DEVOLD
  • MEMBER
  • 105 POSTS
The codes are:
P0315(Crankshaft Position System Variation Not Learned)
P0335(Crankshaft Position Sensor “A” Circuit Malfunction)
P0633(Immobilizer Key Not Programmed ECM/PCM)
P1629(Theft Deterrent Start Enable Signal Not Received)
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Monday, September 19th, 2022 AT 7:54 PM
Tiny
JACOBANDNICKOLAS
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Hi,

Are you using a good key? Have you tried a different one? If the antitheft light is on, will it turn off after approximately 10 minutes with the key in the run position?

The problem is caused by the immobilizer not recognizing the key. When a condition exists which prevents the engine from cranking, the ECM will not receive a signal input from the CKP and the camshaft position (CMP) sensors. We've had codes from both.

Let me know.

Joe
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Tuesday, September 20th, 2022 AT 5:55 PM
Tiny
RONALD DEVOLD
  • MEMBER
  • 105 POSTS
Yes, I have replaced the key because at first I couldn't key the security light off. Once I replaced the key the security light went off and I was able to crank the vehicle. I only was getting that code when I use my Snap on scanner. I am not getting that code with my Autel scanner.
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Wednesday, September 21st, 2022 AT 4:31 AM
Tiny
JACOBANDNICKOLAS
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If you are still getting the code with the Snap-on reader, there is still a problem. Is that the case?

Joe
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Wednesday, September 21st, 2022 AT 2:58 PM
Tiny
RONALD DEVOLD
  • MEMBER
  • 105 POSTS
I ordered and just received a new crank sensor. It's a GM part 213-354. If I install this new sensor, will I have the same issue? I have attached a pic of the part.
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Saturday, September 24th, 2022 AT 5:09 AM
Tiny
JACOBANDNICKOLAS
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Hi,

Hopefully, that will take care of the issue, but there is no guarantee. The problem could be with the wiring or module.

Let me know.

Joe
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Saturday, September 24th, 2022 AT 8:59 PM

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